2819     val2 = None

  2819     val2 = None

  2820     try:

  2820     try:

  2821         # Consume both iterators in an ordered way until one is empty

  2821         # Consume both iterators in an ordered way until one is empty

  2822         while True:

  2822         while True:

  2823             if val1 is None:

  2823             if val1 is None:

  2825             if val2 is None:

  2825             if val2 is None:

  2827             n = choice(val1, val2)

  2827             n = choice(val1, val2)

  2828             yield n

  2828             yield n

  2829             if val1 == n:

  2829             if val1 == n:

  2830                 val1 = None

  2830                 val1 = None

  2831             if val2 == n:

  2831             if val2 == n: